C Programming Source Code Examples

Defensive Programming Techniques

Defensive Programming Techniques

This source code is from Thinking in C++, 2nd Edition, Volume 2, by Bruce Eckel & Chuck Allison. You can use Borland, G++ (For version 3 and above only), Microsoft (For C++ with .NET only) to compile and build this source code. Writing perfect software may be a daunting task for developers, but a few defensive techniques which are routinely applied can go a long way toward narrowing the gap between code and ideal. Defensive programming practices are often used where high availability of the application is required, safety if utmost concern, or security is needed for application to work.

Print days of week in C

Display Days of Week using enum Keyword in C

This C program uses enumerated types to display days of week. The enumerated type is then declared as a different name using typedef keyword i.e. enum days  to typedef enum days days. The function prints for each day of the week, today, yesterday, and tomorrow, both as a string and as a number.

Multiplication of Two Matrices in C

Multiplication of Two Matrices in C

This C code multiplies two 2×2 matrices. It prompts the user to input values for both matrices, displays the input matrices, performs matrix multiplication using nested loops, and then prints the resulting matrix. The code adheres to modern C standards, using printf and scanf for I/O and avoiding outdated functions for better readability and compatibility.

ICMP Ping - C Implementation

ICMP Ping Program in C

This sample illustrates how an ICMP ping app can be written using the SOCK_RAW socket type and IPPROTO_ICMP protocol. By creating a raw socket, the underlying layer does not change the protocol header so that when we submit the ICMP header nothing is changed so that the receiving end will see an ICMP packet. Additionally, we use the record route IP option to get a round trip path to the endpoint. Note that the size of the IP option header that records the route is limited to nine IP addresses.

graphics.h Reference

graphics: graphics.h Header File

This is the graphics.h header file which contains all the graphics functions and their implementations. It is quite nice to have a look at header files just to know more about functions and their parameters. Also it tells about different structures, enums defined in the file for specific purpose.

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